Ab Bofors

Ake Hugo Blomqvist

Bertil Torbjorn Eriksson

Rolf L Stalfors

Apparatus for directing electromagnetic radiation such as a laser beam in a gyro-stabilized direction. The apparatus includes a supporting means on which is fixedly mounted an optical lens having a predetermined focal length and also an element for either detecting the radiation when the apparatus is used to receive the gyro-stabilized beam or for emitting the radiation when the apparatus is used to transmit a gyro-stabilized beam. A mirror is also provided which is mounted on the axis of the lens and, via a cardanic suspension, to the support. The mirror is rotated in its own plane to function as a gyro motor and the beam of radiation is directed so as to impinge upon the reflecting surface of the mirror. Also, the mirror is located at a distance which is one-half the distance of the focal length of the lens from the focal plane of such lens, and the mirror is pivotable about a pivot point on the axis of the lens.

Device for receiving or transmitting radiation

Apparatus for use in a projectile-borne passive infra-red proximity fuse for detecting infra-red radiation emitted from a target. The apparatus includes at least one pair of optical means which are respectively located at spaced locations around the periphery of the projectile. The pair of optical means is so located that the beams of infra-red radiation associated therewith, which are both imaged upon a common detector, form an angle therebetween both in a plane through the longitudinal axis of the projectile and in a plane normal to such axis. Logic circuitry is provided and controlled by the detector to provide a distinctive output in response to the signals which are generated by the beams of radiation received from a target which is spinning about its longitudinal axis and is within a predetermined distance of the projectile. With the arrangement as described, the detection apparatus produces either two separate pulses or one long pulse for each revolution of the projectile about its longitudinal axis, whereas only a single pulse is produced for each revolution from distant sources of infra-red radiation such as the sun.

Passive infra-red proximity fuze

The invention relates to optical target tracking. A target image, particularly based on reflected laser light, is projected by an optical system onto a light-sensitive detector, control signals for directing purposes being generated depending on the position of the target image on the detector surface. At least when a clear target image on the detector surface would be small in comparison with the detector surface, the area of the target image is increased by blurring the target image, for instance by displacing the detector plane from the image plane of the optical system.

Growing community of inventors

Karlskoga, Sweden

Ake Hugo Blomqvist